can I join mbbs with 290 Mark's in neet 2020 in payment quota in any collage in south india???

With a score of 290, your rank might be approximately between 264920-281164 . This is an expected rank range: https://medicine.careers360.com/articles/neet-result-marks-vs-rank . Now regarding the Colleges that you may have a shot at, this is to be honest a  less score. But you might get a seat in Management Quota under Direct admission provided you have registered for the respective State Counselling and has not been able to secure a seat in the Counselling. Or ellse, a seat in GMCs or Private Medical Colleges with this score is difficult. Now this is based on 2019 data and cut offs change every year. Cut offs change every year depending on various factors such as no.of Candidates appearing for the exam, no.of Candidates qualified, top NEET score and difficulty of the exam. For complete list of colleges that you may have a shot at, please use our College predictor: https://medicine.careers360.com/neet-college-predictor?